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Upon exposure to UV radiation, riboflavin gets excited and undergoes intersystem conversion from singlet state into triplet state. With the presence of oxygen atom, there are two types of reaction that will take place, Type 1 reaction produced reactive oxygen species (ROS). These radicals cause destruction of DNA, lysis of pathogens and disruption of cell membrane. Type 2 reaction generates highly reactive singlet oxygen species leading to lysis of pathogens.
